Zhang Mengqin, Gu Mingxin, Shao Li, Cheng Guanyin, Gao Hailin, Sun Bihao, Li Sen, Tang Tian, Li Nan, Yi Yuanbang, Wei Dacheng, Yang Ce, Wei Dapeng
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China.
Chongqing University of Technology, Chongqing, 400054, China.
ACS Appl Mater Interfaces. 2023 Mar 29;15(12):15884-15892. doi: 10.1021/acsami.3c00916. Epub 2023 Mar 17.
Flexible positive pressure sensors have been studied extensively and have been used in a lot of scenarios. However, negative pressure detection is also in demand in some scenarios, such as fluid mechanics analysis, air pressure sensing, and so on. Flexible wearable sensors that can detect both positive and negative pressures will greatly broaden the application field. In this paper, we report a flexible highly sensitive ionic gel (IG) pressure sensor, which is simple and of low cost to prepare and can reliably detect a large pressure range from -98 to 100 kPa under an atmospheric pressure of about 982 hPa. The IG dielectric layer is composed of polyvinyl alcohol and phosphoric acid with a random microstructure of sandpaper inversion. The sensor exhibits flexibility, cycling stability, and high sensitivity under both negative and positive pressures ( = 84.45 nF/kPa for the negative pressure section, = 25.61 nF/kPa for the positive pressure section). These sensors could be worn on the body not only to test breathing and pulse but also to measure air pressure for estimating the altitude, showing that the flexible full-pressure sensors have a wider application range in wearable electronics.
柔性正压传感器已得到广泛研究，并已应用于许多场景。然而，在某些场景中，如流体力学分析、气压传感等，负压检测也有需求。能够同时检测正压和负压的柔性可穿戴传感器将极大地拓宽应用领域。在本文中，我们报道了一种柔性高灵敏度离子凝胶（IG）压力传感器，其制备简单且成本低廉，在约982 hPa的大气压力下能够可靠地检测从 -98至100 kPa的大压力范围。IG介电层由聚乙烯醇和磷酸组成，具有砂纸反转的随机微观结构。该传感器在负压和正压下均表现出柔韧性、循环稳定性和高灵敏度（负压部分为84.45 nF/kPa，正压部分为25.61 nF/kPa）。这些传感器不仅可以佩戴在身体上测试呼吸和脉搏，还可以测量气压以估计海拔高度，表明柔性全压传感器在可穿戴电子设备中具有更广泛的应用范围。
